Hybrid drive arrangement of a motor vehicle

Abstract

A hybrid drive arrangement of a motor vehicle, which has a main transmission having an input shaft and housing. An electric machine, that can operate either as a motor and a generator, has a stator and rotor which, on the input side, is connected to the main transmission. A planetary gearset is arranged between the rotor and the transmission input shaft. The transmission input shaft has a central oil bore and transverse bores for supplying oil to the planetary gearset and the electric machine. The planetary gearset and the electric machine are accommodated in a hybrid housing. The hybrid housing is connected to the transmission housing of the main transmission by an oil return line. The oil stream passing into the oil return line is in heat-transferring connection, by way of a partition wall, with a coolant which flows through a cooling duct arranged radially outside the stator.

The invention claimed is: 
     
       1. A hybrid drive arrangement for a motor vehicle, the hybrid drive arrangement comprising:
 a main transmission with a transmission input shaft and a transmission housing, 
 an electric machine ( 25 ) being operable as a motor and as a generator and comprising a stator ( 25   a ) and a rotor ( 25   b ), and the electric machine ( 25 ) being connected to an input side of the main transmission, 
 a planetary gearset being arranged between the rotor ( 25   b ) and the transmission input shaft, 
 the transmission input shaft having a central oil bore and transverse bores for supplying oil to the planetary gearset and the electric machine ( 25 ), 
 the planetary gearset and the electric machine ( 25 ) being accommodated in a hybrid housing ( 20 ), 
 the hybrid housing ( 20 ) being connected to the transmission housing of the main transmission by way of an oil return line ( 42 ), 
 a cooling duct ( 50 ) being arranged radially outside the stator ( 25   a ) through which coolant flows, and 
 an oil stream passing into the oil return line ( 42 ) is in heat-transferring connection with the coolant. 
 
     
     
       2. The hybrid drive arrangement according to  claim 1 , wherein the cooling duct ( 50 ) has a heat-conducting partition wall ( 54 ) past which the oil stream flows. 
     
     
       3. The hybrid drive arrangement according to  claim 1 , wherein an oil cooling chamber ( 53 ), through which the oil stream can flow and which is delimited relative to the cooling duct ( 50 ) by a heat-conducting partition wall ( 54 ), is arranged geodetically under the cooling duct ( 50 ). 
     
     
       4. The hybrid drive arrangement according to  claim 3 , wherein the oil cooling chamber ( 53 ) is arranged in the hybrid housing ( 20 ). 
     
     
       5. The hybrid drive arrangement according to  claim 3 , wherein the oil cooling chamber ( 53 ) has an inlet opening and an outlet opening ( 53   a ,  53   b ). 
     
     
       6. The hybrid drive arrangement according to  claim 5 , wherein the outlet opening ( 53   b ) is arranged in an inlet area of the oil return line ( 42 ). 
     
     
       7. A hybrid drive arrangement of a motor vehicle, the hybrid drive arrangement comprising:
 a main transmission having a transmission input shaft; 
 a transmission housing; 
 an electric machine being operable as a motor and a generator, the electric machine having a stator and a rotor, the rotor being connected to an input side of the main transmission, and the stator being radially surrounded by a cooling jacket which is radially surrounded by a hybrid housing; 
 a planetary gearset being arranged between the rotor and the transmission input shaft, and the transmission input shaft having a central oil bore and transverse bores for supplying oil to the planetary gearset and the electric machine; 
 the planetary gearset and the electric machine being accommodated in the hybrid housing, and the hybrid housing being connected to the transmission housing of the main transmission by way of an oil return conduit; 
 a cooling passage being radially defined by the cooling jacket and the hybrid housing, and the hybrid housing comprising a heat-conducting partitioning wall having a radially interior surface and a radially exterior surface; and 
 a coolant within the cooling passage flows across the radially interior surface of the partitioning wall and an oil stream within the oil return conduit flowing across the radially exterior surface of the partitioning wall to facilitate transfer of heat from the coolant in the cooling passage through the partitioning wall to the oil stream in the oil return conduit.